陕西汉阴黄龙金矿稀土元素地球化学特征

Rare Earth Elements Geochemical Characters of Huanglong Golden Deposit in Hanyin,Shaanxi Province

采用ICP-MS方法研究了陕西汉阴黄龙金矿黑色岩系中稀土元素地球化学特征和形成条件。稀土总量在全岩和硫化物中含量为91.55-331.31×10^-6g.g^-1。轻稀土富集,分布曲线较陡,重稀土曲线较为平缓,与陕西八卦庙金矿和华南黑色页岩系中的稀土元素地球化学特征相似。Eu,Ce呈负异常,反映黑色岩系形成于干燥气候的陆棚边缘浅海的还原环境。

The REE geochemical characters and formational conditions of the black shale series in the Huanglong golden deposit in Hanyin Shaanxi Province were discussed based on ICP-MS analytical data. The total REE contents of the black shale series were 91.55-331.31 ×10^-6 g,g^-1, and the light REEs was enriched. The distribution graph of light REEs was steeper than the heavy REEs. The REE geochemical characters was similar in Huanglong golden deposit, Baguamiao golden deposit and the black shale series in south of China. The negative anomalies of Eu and Ce showed that the Huanglong golden deposit formed in an epeiric sea environment. The REE patterns indicated that the black shale series resulted from mixing of normal seawater sediments and hot bittern seawater sediments from magma.